Efficient Functionalization of Organosulfones via Photoredox Catalysis: Direct Incorporation of -Carbonyl Alkyl Side Chains into -Allyl--Ketosulfones.

A novel and efficient method for functionalizing organosulfones has been established, utilizing a visible-light-driven intermolecular radical cascade cyclization of -allyl--ketosulfones. This process employs -Ir(ppy) as the photoredox catalyst and -carbonyl alkyl bromide as the oxidizing agent. Via this approach, the substrates experience intermolecular addition of -carbonyl alkyl radicals to the alkene bonds, initiating a sequence of C-C bond formations that culminate in the production of organosulfone derivatives.

Visible-Light-Induced Difunctionalization of Alkenyl Ketones with α-Carbonyl Alkyl Bromide: Concomitant Installation of C-C Bonds.

The visible-light-promoted difunctionalization of alkenyl ketones has been developed for easy access of various tetralones, cyclopropane, or alkenyl migration compounds. With -[Ir(ppy)] as the photocatalyst, alkenyl ketones captured the α-carbonyl alkyl radical and evolved through intramolecular cyclization and the elimination of a proton to give the difunctionalized products. This strategy is characterized by good yields, mild reaction conditions, and outstanding functional group tolerance.

Di-, tri- and tetraphosphine-substituted Fe/Se carbonyls: synthesis, characterization and electrochemical properties.

The active sites of [FeFe]-hydrogenase promoted by Fe/E (E = S, Se) clusters have attracted considerable interest due to their significance in understanding the interconversion of hydrogen with protons and electrons. As an extension of the study on Fe/Se clusters related to H-cluster model compounds of [FeFe]-hydrogenase, a series of tertiary phosphine substituted Fe/Se carbonyls were successfully prepared. The treatment of Fe(μ-SePh)(CO) (A) and excess PR resulted in the ferrous bis(selenolate) carbonyls Fe(SePh)(CO)(PR) (PR = PPhMe, 1; PMe, 2) in moderate yields.

Novel triorganotin complexes based on phosphonic acid ligands: Syntheses, structures and in vitro cytostatic activity.

Six novel organotin phosphonate complexes, [(MeSn)(HL)]1, [(MeSn)(HL)]2, [(MeSn)L(HO)]3, [(PhSn)(HL)]4, [(PhSn)L]5 and [(PhSn)L]6, derived from phosphonic acid ligands [NaHL = 1-CHOPO(OH)Na, HL = 1-CHPO(OH), HL = 2-CHPO(OH)], have been synthesized and characterized by elemental analysis, FT-IR, NMR (H, C, P and Sn) spectroscopy and X-ray crystallography. The structural analysis reveals that complexes 1 and 5 display 1D infinite zig-zag chain structures, and complex 2 shows 1D right-handed helical chain structure, while complex 3 displays 1D left-handed helical chain structure. Complexes 4 and 6 are 24-membered macrocyclic rings interconnected by P, O and Sn atoms.

A novel octa-nuclear 32-membered zirconocene macrocycle based on the aromatic selenite.

A novel macrocyclic zirconocene(iv) aromatic selenite [(CpZr)L]·2(CpZr(μ-O)Cl) (complex 1) (Cp = cyclopentadienyl anion; L = 4-fluorobenzeneseleninic acid) was prepared by the reaction of bis(cyclopentadienyl)zirconium dichloride with 4-fluorobenzeneseleninic acid and characterized by elemental analysis, infrared spectroscopy, H, C NMR spectroscopy, ESI-MS, XRD and X-ray diffraction. The structure analysis shows that complex 1 is a centrosymmetric 32-membered macrocycle containing an eight-nuclear zirconocene. In this complex, the 4-fluorobenzeneseleninic acid ligands adopt bidentate mode in coordinating to zirconium, which play a bridging role in the formation of a macrocycle.

Syntheses, structures and anti-tumor activity of four new organotin(iv) carboxylates based on 2-thienylselenoacetic acid.

With the 2-thienylselenoacetic acid ligand, four new organotin complexes, [Me3Sn(O2CCH2SeC4H3S-o)]n (), [(Ph3Sn)6(O2CCH2SeC4H3S-o)6] (), [(Me2Sn)4(μ3-O)2(O2CCH2SeC4H3S-o)4] (), and [(PhSn)6(μ3-O)6(O2CCH2SeC4H3S-o)6] (), have been synthesized and characterized by X-ray crystallography, elemental analysis, FT-IR and NMR ((1)H, (13)C, and (119)Sn) spectroscopy. The structure analysis indicates that complex adopts a 1D infinite zig-zag chain structure, while complex shows a centrosymmetric hexanuclear 24-membered macrocycle. In contrast, complex and complex display ladder and drum structures, respectively.

Bis(4,6-dimethyl-pyrimidine-2-thiol-ato)dimethyl-tin(IV).

The asymmetric unit of the title complex, [Sn(CH(3))(2)(C(6)H(7)N(2)S)(2)], contains two independent mol-ecules with similar configurations. In each, the Sn(IV) cation is coordinated by two methyl and two 4,6-dimethyl-pyrimidine-2-thiol-ate anions in a distorted SnS(2)C(2) tetra-hedral geometry. In the two mol-ecules, the S-Sn-S bond angles are 87.

catena-Poly[[(3-methyl-sulfanyl-1,2,4-thia-diazole-5-thiol-ato)sodium]di-μ-aqua-κO:O].

The crystal structure of the title compound, [Na(C(3)H(3)N(2)S(3))(H(2)O)(2)](n), features polymeric chains made up of O⋯O edge-shared NaSN(H(2)O)(4) units running along the b axis. The Na(+) ion and all non-H atoms of the thia-diazole ligand lie on a mirror plane.